The patella, also known as the kneecap, plays a crucial role in facilitating various movements and activities performed by the human body. This small bone bears a significant portion of the body’s weight, making it an essential part of our musculoskeletal system. Interestingly, we are born without kneecaps, instead having cartilaginous structures that eventually transform into the patella by around the age of five or six. The patella serves a more complex purpose than just being a protective covering; without it, even simple actions like taking a step can lead to painful complications.
Structure of the Patella
The patella, also known as the kneecap, is a unique bone located in the front of the knee joint. It has a flat, circular shape resembling an apostrophe and is classified as a sesamoid bone, which means it is embedded within muscles or tendons.
Embedded in the fascia lata, a deep enclosure in the thigh, the patella serves as the central component of the knee joint. It connects to both the patellar ligament and the tendon of the rectus femoris, a muscle responsible for flexing the hip.
One notable feature of the patella is the specialized cartilage present on its backside. This cartilage plays a crucial role in ensuring smooth and frictionless movement between the patella and the trochlear groove of the femur, allowing for efficient knee joint function.
Blood Supply to the Knee Cap
The knee cap, or patella, is supported by two distinct vascular systems. The first one is called the extraosseous system, which consists of a network of interconnected genicular arteries. These arteries connect behind the patellar ligament in the fat deposit. The second system is the intraosseous system, which is made up of vessels that enter the patella through a specific opening. Additionally, there is another set of vessels that enter the deep surface of the knee cap.